Improvement in steam-engine g-lobe-valves



in section, of my improved steam-valve.

UNITED STATES PATENT CEFICE.,

R. A. FILKINS, OF NORTH ADAMS, MASSACHUSETTS.

IMPROVEMENT IN STEAM-ENGINE GLOBE-VALVES.

Specification forming part of Letters Pateat No. 80,160, dated July 21,1868.

To all ywhom it may concern :v

Be it known that I, R. A. FILKINS, ot' North Adams, in the county ot'Berkshire and State of Massachusetts, have invented a new and usefulImprovement in Steam-Valves; and I do hereby declare that the followingis a full,

clear, and exact description thereof, which will enable others skilledin the art to make and use the same, reference heilig had to theaccon'lpanying drawings, forming part of this speciiication, in which-Figures 1 and 2 are side elevations, partly Fig. 3 is a verticallongitudinal section ot' i he same. Fig. 4 is a horizontal section ot'the saine, taken on the line een; of Fig. 3.

Similar letters of reference indicate corresponding parts.

This invention relates to a new steam-valve, which is so arranged thatit can be worked up and down with perfect ease., while it closes theparts perfectly steam and air tight.

The invention consists of a plug or valve, which is made ot' twosections fitted around a tapering stem that is smallest at its lowerend, and ot' two lingers pivoted between the sections. The fingers catchunder a shoulder of' the stem, but when the valve is on its seat theyrelease the stem and allow it to be forced down between the sections soas to spread them laterally apart. The port-holes will thus be moreeii'ectually closed.

A, in the drawings, represents the tube in which the valve is arranged.This tube rises fiom and interrupts a tube, B, as in'Fig. 3,

there being two openings (e a thus formed where the tubes connect, Theannular seat b is formed under the tube A.

C represents the valve-stem. The same screws through the cover B of thetube A, and its lower part is of inverted conical form, having aprojecting head, c, at the lowermost end.

The valve E is of cylindrical form, and is cut in two semicylindricalshells or pieces, as shown, which tit both around the conical part ofthe stem. Between the pieces of the valve are pivoted on opposite sidesofthe stem two L-shaped fingers el d, as shown, which project with theirback edges beyond the periphery of y down with the stem.

The lower endsof the grooves e are enlarged, as in Figs. l and 2. Whenthe plug is elevated to keep the passage in B open, as in Fig. 1, thelingers will, with their ends, lit under the head e, and will lock theplug to the stem and the stem to the plug but when the plug has reachedits seat, the ingers t into the enlarged portions of the grooves andliberate the stem, as in Fig. 2, so that now :he stem can be moved downbetween the sectionsvof the plug to force them tight aga-inst the sidesof the tube A. The parts a a will then be closed perfectly air-tight, asby means 'ot' the conical shape of the stem any required degree oflateral motion can be imparted to the sections ot' the plug.

That portion of the stem which is surrounded by the plug may be eithersmooth, as shown, or may have a screw-thread.

Having thus described my invention, I claim as new, and desire to secureby Letters `Patent-- 1. A sectional valve, E, fitted around a stem,

e, and provided with pivoted fingers el d, sub-V

